The main raw material of Synthetic Graphite is high quality calcined petroleum coke, with adding asphalt to be bonded, and add some other materials. After preparing these raw materials, they should be pressed into mold, then graphitize them in the non-oxidation environment with 2500-3000 ℃. After calcining with high temperature, the components of sulfur, ash, and gas are greatly reduced.
The calcining of petroleum coke is mainly in order to remove sulfur, moisture and volatile. They have to be calcined with the temperature of 1200-1350 ℃, only by these can be formed basically pure carbon because of the high impurity content of raw petroleum coke.
Natural graphite can be divided into flake graphite and microcrystalline graphite. Flake graphite need to be purified chemically, or heated to high temperature to decompose and volatile the oxide.Flake graphite production is low, and the price is high. Microcrystalline graphite is of high ash content, it should not be used as casting recarburizer commonly.
Generally, the cycle of synthetic graphite is better than natural graphite, which is more attractive with reasonable price. Natural graphite is soft. If the compaction is higher, it can make the grain transform, and fluid absorption capacity decline sharply.
Article From china graphite manufacturers company-XRD Graphite Manufacturing Co., Ltd.
Article From: http://www.xrdcarbon.com/news/109.html
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